Method of preparing compressed gases



. R m N E v m m HT ORNLYS.

Aug. 19., 1930. c. w. P. HEYLANDT METHOD OF PREPARING COMPRESSED GASES Filed'Aug. '24. 1928 Patented Aug. 19, 1930 CHRISTIAN WILHELI PAUL HEYLANDT, OF LANKWITZ, BERLIN, GEBIAIY METHOD OF PREPARING COMPRESSED GASES HElSSUED Application filed August 24, 1928, Serial No. 301,888, and in Germany September 20, 1927.

This invention relates to a method of preparing compressed gas of high pressure from a body of liquid enclosed in an insulated pressure vessel, the principal object of the inven' tion being to provide a method by means of which uniform and adequate generation of gas at a ressure higher than the critical pressure the as is obtained.

A further ob]ect of the invention is to provide a method whereby the gases given ofi by a body of liquid within an insulated pressure container may be heated and then rought into heat-interchangingrelation to said ody-of liquid thereby to raise the pressure in the container and accelerate evaporation of the liquid.

The pressure vessel usually employed in reparing compressed gases operates satisactorily up to the criticalpressure of the particular liquefied gas which is to be evaporated and converted into compressed gas, so that any desired quantity of compressed gas can be withdrawn at constant pressure either continuously or intermittently. Such pressure vessels, however, are built and used to withstand a working pressure which lies betil low the critical pressure of the particular liquefied gas to be evaporated. The reason for this is, that below the critical pressure there is in the inner container, during the .whole period of evaporation, liquid such as is required for preparing the compressed as. v

g The conditions change, however, immediately it is decided to produce highly compressed grs at about 150 to 200 atmospheres; since it t en becomes necessary to exceed, the

limit of critical pressure (52 atmospheres for oxygen) having regard to the dimensions of the vessel for the com ressed gas necessitated'by the pressure. this case a constant working pressure cannot be maintained, as the pressure chamber is not filled with liquid, and only very cold vapours having a high saturation point pass into the evaporating coil. In such case no more liquid is evaporated in the heatingecoil, but onl cold gas will still continue to superheate It, therefore, the pressure is not to fall, notwithstanding the consumption, provision must be made for the supply of additional heat, as the superheating of the saturated cold gas in the pressure vessel would otherwise not proceed rapidly enough.

The object of the present invention is to 5!) overcome the disadvantages above pointed out and to provide a method by means of which the generation of the gas at the desired ressure can be maintained uniform and a equate.

In the drawing accompanying this specification,

Fig. 1 is a central vertical section throu h an apparatus suitable for carrying out t e improved method; 7

Fig. 2 is a similar .view of a modified form of apparatus; and

Fig. 3 is a fragmentary sectional-view illustrating on an enlarged scale the controlling valve.

Referring to the drawing, 1 designates the pressure vessel, which is provided with a thin-walled inner receptacle g for the reception of the liquefied gas. This receptacle, owing to its thin wall is cooled off comparatively quickly by the liquefied gas so that the evaporation during the filling is small. The pressure vessel 1 is disposed within and spaced from an outer container 2, the s ace bet-ween the container and pressure vesse being filled with a suitable insulating material 4. The pressure vessel is provided at one oint with a filling opening normally closed y a suitable screw plug 9, said opening being enclosed by a neck or pipe 8 extending from the pressure vessel and communicating with the atmosphere outside of the container 2, whereby the insulating material is revented from covering the closing p ug. When the vessel is to be filled, the plug 9 may be removed by means of a socket wrench or other suitable tool inserted through the neck 8. Within the inner receptacle g is disposed a vertical pipe 7, the lower end of said pipe being in close proximity to the bottom of the receptacle while its upper end passes through the walls of said receptacle and the pressure vessel 1 and communicates with a pi which is bent to form coils 5, 6, disposed within the insulation material, a portion of posed portion said pipe extending through the wall of the container 2 to the outside thereof, while the inner end of the ipe is in communication by way of a need e valve 3 with the upper portion of the receptacle g. The outer exposed portion 10 of this coiled pipe communicates with a conduit 0 adapted to communicate with a gas receiver (not shown), a valve 11 being disposed between said conduit and the pi 10.

In ig. 1 a heatin coil 6 is shown disposed within the insu ating material in encircling relation to the pressure vessel 1, said coil at one end communicating with a pipe (I which in turn communicates with the conduit 6 at one side of the valve 11, the opposite end of the coil communicating with the exipe 10 at the opposite side of said valve t e latter communication being controlled by a valve a. It will thus be seen that the coil b communicates with the conduit 0 at both sides of valve 11.

In Fig. 2, the coil 6 is disposed within the thin walled receptacle g instead of encircling the outer pressure vessel 1. Otherwise the construction and connections are the same as described in connection with Fig. 1. In both forms the conduit 0 may be rovided with a reheating coil, as indicated diagrammatically at n o ration, with the valve 11 closed and the va ves a and 3 open, the gas above the level of the liquid in the rece tacle 9 will flow into the coil pipe 5, 6m after being heated by pasing through the exposed portion 10 of said p1 vessel 1, or the contents of the receptacle d rectly, depending on whether the coil 6 is disposed as shown in Fig. 1 or Fig. 2. The

understood as a limitation, as I am well aware that the method can be applied to all liquefiable I claim:

1. The method of preparing com ressed gases of high pressure from a body 0 liquid enclosed in an insulated pressure container which consists in heating gases given elf by said liquid, then bringing said heated fisies into heat interchanging relation to said y of liquid, whereby the pressure in the container is raised and the evaporation of the liquid is accelerated, and then further heating said gases and conducting them under the high pressure to the point'of use.

2. The method of preparing com ressed gases of high pressure from a body 0 liquid enclosed in an insulated pressure container which consists in subjecting gases given oil by said liquid to the temperature of the surrounding atmosphere thereby to heat the then conducting said heated ases into eat interchanging relation to sai body of liquid thereb to raise the pressure in the container and accelerate evaporation qf the liquid, and then further heatin said gases and conducting them under the high pressure to the point 0 use.

In testimony whereof I have signed my name to this specification.

Da. PAUL HEYLANDT.

, pe, thro valve a into the coil 6 thereby heating t lfia pressure gas, after thus givingup its heat, from the coil 6 through pipe d to the conduit 6,

ma In M. :-:'.-u to desired destination, a reheating by I) the coil f. On the other hand, wit

the valves 11. and 8 closed and the valve a open, vaporization will occur within the receptacle owing the insulation. The va r thus produced will create ressure wit 'u the receptacle, whereby the quid will be forced out-th pipe 7, coils 5, 6 where it is converted into vapor, which into pipe 10,

.where it is superheated'by :he heat of the gen. Thisltatulmghoweveqisnotto to the leaking of heat through atmosphere, and through valve coil 6, ipedandconuiteasabovesdzfo h n w todiscontinue teoperafion eapara 'itisneces- I saryonl tocloaethevfiveamopenvalves 

